Herewin is one of the leading manufacturers of Lithium Polymer Batteries, with factories in Southern China comprising over 50,000 m2 of production area, 1000 employees and a daily battery capacity of over 200,000Ah.

Major R & D, Engineering and QC departments, including certifications and approvals for CE, RoHS, UN38.3 and others, means HAIYIN battery packs are fully tested to meet or exceed their published specifications prior to leaving the factory. Haiyin states “True Specs”, including pack & cell capacity, discharge “C” rates, expected life cycles, maximum current and maximum charge rates.

Haiyin Batteries' representative Eric was kind enough to send me some packs for my general opinion and some tests.

I recieved 2 packs of 3s 1000mAh and 3s 2200mAh each, and one TX battery pack.

All packs are nicely made, with shrink wrap around them and with both ends protected with additional plastic material. The balancing cables are silicon wires, and the main leads as well.
The wire lenght was perfect on the 1000mAh and the TX pack, but a little short on the 2200mAh packs. As one can see in the photos, this issue was corrected.
A nice touch of the TX pack is, that two sets of main leads are present. Some people prefer to open their TX to charge the pack directly. The 2nd set of main leads allows for a dedicated charge connector. This means that the main connector can stay connected all the time, which is a safety improvement.

Before flying, I cycled all packs 2-3 times at a low C-rate.

On all planes, I use my telemetry with capacity warning, which is set to 80% of the capacity.

The 1000mAh packs were tested in a robbe Nano-Racer, which is a small warbird. I used Turnigy Nanotec packs before.
When I used the Haiyin packs without prior warming, they performed just as well. They came out just below handwarm from a flight with continous full throttle, meaning around 15A. Everything works as advertised here.

The 2200mAh packs were used in a MPX FunJet, which pulls between 24 and 30A. It is equipped with a thrust vector system, and a powerful selfbuilt and selfwound motor, allowing for unlimited vertical flight.
Here I used the cheap Turnigy Flightmax before.
When I switched to Haiyin the next flight, I noticed an improvement immediately. Climbing and horizontal speed were both a notch faster, and the sound had a higher pitch as well. My flying buddys beside the field also noticed the better power.

My current workhorse, my new SuperSkyflex Rogallo Plane, also got a lot of flights with the new Haiyin packs. It flies stable enough to allow me to watch the telemetry data on the ground, and after around 15 cycles, both voltage and current have not degraded.
I use 2 2200mAh packs in parallel here, giving me around 20min of flight time.

I have made an aerial video of one of the flights.
As you can see, my neighbor's children like it quite a lot.

"High rate performance"......Running 'em at a maximum of 4C is not worthwhile......What I want to see is the discharge curve at the 30C rate... a 2200 @ 30C = 66A... only then can we see if they hold up to their advertised rating... i.e. that they can deliver the full C-rate discharge at above 3v/cell for 90% of the rated capacity..... that's almost 2 minutes before they hit LVC.

Haiyin Batteries' representative Eric was kind enough to send me some packs for my general opinion and some tests.

I recieved 2 packs of 3s 1000mAh and 3s 2200mAh each, and one TX battery pack.

All packs are nicely made, with shrink wrap around them and with both ends protected with additional plastic material. The balancing cables are silicon wires, and the main leads as well.
The wire lenght was perfect on the 1000mAh and the TX pack, but a little short on the 2200mAh packs. As one can see in the photos, this issue was corrected.
A nice touch of the TX pack is, that two sets of main leads are present. Some people prefer to open their TX to charge the pack directly. The 2nd set of main leads allows for a dedicated charge connector. This means that the main connector can stay connected all the time, which is a safety improvement.

Before flying, I cycled all packs 2-3 times at a low C-rate.

On all planes, I use my telemetry with capacity warning, which is set to 80% of the capacity.

The 1000mAh packs were tested in a robbe Nano-Racer, which is a small warbird. I used Turnigy Nanotec packs before.
When I used the Haiyin packs without prior warming, they performed just as well. They came out just below handwarm from a flight with continous full throttle, meaning around 15A. Everything works as advertised here.

The 2200mAh packs were used in a MPX FunJet, which pulls between 24 and 30A. It is equipped with a thrust vector system, and a powerful selfbuilt and selfwound motor, allowing for unlimited vertical flight.
Here I used the cheap Turnigy Flightmax before.
When I switched to Haiyin the next flight, I noticed an improvement immediately. Climbing and horizontal speed were both a notch faster, and the sound had a higher pitch as well. My flying buddys beside the field also noticed the better power.

My current workhorse, my new SuperSkyflex Rogallo Plane, also got a lot of flights with the new Haiyin packs. It flies stable enough to allow me to watch the telemetry data on the ground, and after around 15 cycles, both voltage and current have not degraded.
I use 2 2200mAh packs in parallel here, giving me around 20min of flight time.

I have made an aerial video of one of the flights.
As you can see, my neighbor's children like it quite a lot.

I ordered a couple of Haiyin packs and tested them today. Good power and they look very high quality. I also ran into a couple of snags with my order (Paypal's fault) and the support from the online store was top notch, which was a pleasant surprise. Will be ordering more to replace my worn-out Turnigy's.

I ordered a couple of Haiyin packs and tested them today. Good power and they look very high quality. I also ran into a couple of snags with my order (Paypal's fault) and the support from the online store was top notch, which was a pleasant surprise. Will be ordering more to replace my worn-out Turnigy's.

Could you plese show us your test graphs that would be helpful.
Mainly ones at packs c rating.

In addition to discharge graphs, could someone post internal resistance numbers and conditions (# of cycles, charge state, pack temperature, measuring equipment)? Precious few of us here possess the ability and experience to properly interpret graphs and make meaningful comparisons with other lipoly packs.

Since internal resistance is dramatically easier for the layman to interpret and there's a nearly 1:1 relationship between internal resistance and a typical discharge graph, it's far more useful than graphs, at least in my analysis.

Having knowledge of the pedigree of the pack would be helpful as well (free pack from vendor, ordered from supplier, etc.).

"High rate performance"......Running 'em at a maximum of 4C is not worthwhile......What I want to see is the discharge curve at the 30C rate... a 2200 @ 30C = 66A... only then can we see if they hold up to their advertised rating... i.e. that they can deliver the full C-rate discharge at above 3v/cell for 90% of the rated capacity..... that's almost 2 minutes before they hit LVC.

4C is the maximum I could run with the CBA III. The difference in mid point voltage from C/5 (440 mA) and the mid point at 4C will allow you to calcualte (V1 - V2)/(I2 - I1) the internal impedance and then get a pretty good indication of capacity delivered to cutoff at the 30C rate.

What you want to see is the 30C discharge. I don't have the equipment to provide that kind of a load. I don't think many would run 2200 mAH pack at 66 amps in the first place.

Better than this I would like to see any manufacture or provider of LiPo packs show THEIR test data supporting 20C/30C/40C or 50C claims along with the service longevity when discharged at these rates.